<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator="/">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>商品分类</el-breadcrumb-item>
		</el-breadcrumb>
		<!-- 卡片视图区域 -->
		<el-card>
			<el-row>
				<el-col><el-button type="primary" @click="showAddCateDialog">添加分类</el-button></el-col>
			</el-row>
			<!-- 表格 -->
			<tree-table :data="cateList" :columns="columns" :selection-type="false" :expand-type="false" show-index index-text="#" border :show-row-hover="false" class="treeTable">
				<!-- 是否启用 -->
				<template slot="isok" slot-scope="scope">
					<i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: limegreen;"></i>
					<i class="el-icon-error" v-else></i>
				</template>
				<!-- 排序 -->
				<template slot="order" slot-scope="scope">
					<el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
					<el-tag size="mini" type="success" v-else-if="scope.row.cat_level === 1">二级</el-tag>
					<el-tag size="mini" type="warning" v-else>三级</el-tag>
				</template>
				<!-- 操作 -->
				<template slot="opt" slot-scope="scope">
					<el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditCateDialog(scope.row.cat_id,scope.row.cat_pid)">编辑</el-button>
					<el-button type="danger" size="mini" icon="el-icon-delete" @click="removeCate(scope.row.cat_id)">删除</el-button>
				</template>
			</tree-table>
			<!-- 分页区域 -->
			<el-pagination
				@size-change="handleSizeChange"
				@current-change="handleCurrentChange"
				:current-page="queryInfo.pagenum"
				:page-sizes="[1, 2, 5, 10]"
				:page-size="queryInfo.pagesize"
				layout="total, sizes, prev, pager, next, jumper"
				:total="total"
				background
				hide-on-single-page
			></el-pagination>
		</el-card>

		<!-- 添加分类的对话框 -->
		<el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
			<!-- 添加分类的表单 -->
			<el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
				<el-form-item label="分类名称" prop="cat_name"><el-input v-model="addCateForm.cat_name"></el-input></el-form-item>
				<el-form-item label="父级分类">
					<el-cascader v-model="selectedKeys" :options="parentCateList" :props="cascaderProps" clearable change-on-select @change="parentCateChanged"></el-cascader>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="addCateDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="addCate">确 定</el-button>
			</span>
		</el-dialog>
		
		<!-- 编辑分类的对话框 -->
		<el-dialog title="添加分类" :visible.sync="editCateDialogVisible" width="50%">
			<!-- 添加分类的表单 -->
			<el-form :model="editCateForm" :rules="editCateFormRules" ref="editCateFormRef" label-width="100px">
				<el-form-item label="父级分类" ><el-input disabled v-model="editParentName"></el-input></el-form-item>
				<el-form-item label="分类名称" prop="cat_name"><el-input v-model="editCateForm.cat_name"></el-input></el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="editCateDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="editCate">确 定</el-button>
			</span>
		</el-dialog>
	</div>
</template>

<script>
export default {
	data() {
		return {
			queryInfo: {
				type: 3,
				pagenum: 1,
				pagesize: 5
			},
			// 商品分类的数据列表
			cateList: [],
			// 总数据条数
			total: 0,
			// 为table指定列的定义
			columns: [
				{
					label: '分类名称',
					prop: 'cat_name'
				},
				{
					label: '是否启用',
					type: 'template',
					template: 'isok'
				},
				{
					label: '排序',
					type: 'template',
					template: 'order'
				},
				{
					label: '操作',
					type: 'template',
					template: 'opt'
				}
			],
			// 控制添加分类对话框的显示与隐藏
			addCateDialogVisible: false,
			// 添加分类的表单数据对象
			addCateForm: {
				cat_name: '',
				cat_pid: 0,
				cat_level: 0
			},
			// 添加分类的表单验证规则对象
			addCateFormRules: {
				cat_name: [
					{
						required: true,
						message: '请输入分类名称',
						trigger: 'blur'
					}
				]
			},
			// 父级分类的列表
			parentCateList: [],
			// 级联选择器配置对象
			cascaderProps: {
				expandTrigger: 'hover',
				label: 'cat_name',
				value: 'cat_id',
				children: 'children'
			},
			// 选中的父级分类的ID数组
			selectedKeys: [],
			// 控制编辑分类对话框的显示与隐藏
			editCateDialogVisible: false,
			// 编辑分类的表单数据对象
			editCateForm: {},
			// 编辑分类的表单验证规则对象
			editCateFormRules: {
				cat_name: [
					{
						required: true,
						message: '请输入分类名称',
						trigger: 'blur'
					}
				]
			},
			// 编辑分类的父分类名称
			editParentName:''
			
		}
	},
	created() {
		this.getCateList()
	},
	methods: {
		// 获取商品分类数据
		async getCateList() {
			const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
			if (res.meta.status !== 200) {
				return this.$message.error('获取商品分类失败！')
			}
			// console.log(res.data)
			// 把数据列表赋值给cataList
			this.cateList = res.data.result
			// 为总数据条数赋值
			this.total = res.data.total
		},
		// 监听 pageSize改变
		handleSizeChange(newSize) {
			this.queryInfo.pagesize = newSize
			this.getCateList()
		},
		// 监听 pageNum改变
		handleCurrentChange(newPage) {
			this.queryInfo.pagenum = newPage
			this.getCateList()
		},
		// 点击按钮展示添加分类的对话框
		showAddCateDialog() {
			// 先获取父级分类的数据列表
			this.getParentCateList()
			this.addCateDialogVisible = true
		},
		// 获取父级分类的数据列表
		async getParentCateList() {
			const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
			if (res.meta.status !== 200) {
				return this.$message.error('获取父级分类失败！')
			}
			this.parentCateList = res.data
		},
		// 选择项发生变化
		parentCateChanged() {
			// console.log(this.selectedKeys)
			// 如果selectedKeys数组中的length大于0,证明选中的有父级分类
			if (this.selectedKeys.length > 0) {
				this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
				this.addCateForm.cat_level = this.selectedKeys.length
				return
			} else {
				// 父级分类ID
				this.addCateForm.cat_pid =0 
				this.addCateForm.cat_level=0
			}
		},
		// 点击按钮添加分类
		addCate(){
			// console.log(this.addCateForm)
			this.$refs.addCateFormRef.validate(async valid=>{
				if(!valid) return
				const {data:res} = await this.$http.post('categories',this.addCateForm)
				if (res.meta.status !== 201) {
					// console.log(res.meta.msg)
					return this.$message.error(res.meta.msg)
				}
				this.$message.success('添加分类成功')
				this.getCateList()
				this.addCateDialogVisible = false
			})
			
		},
		// 监听对话框的关闭事件，重置表单数据
		addCateDialogClosed(){
			this.$refs.addCateFormRef.resetFields()
			this.selectedKeys = []
			this.addCateForm.cat_level = 0
			this.addCateForm.cat_pid = 0
		},
		// 展示编辑分类对话框
		async showEditCateDialog(id,pid){
			const {data:res} = await this.$http.get('categories/'+id)
			if (res.meta.status!==200){
				return this.$message.error('获取分类数据失败！')
			}
			if (pid==0){
				this.editParentName = '无'
			} else {
				const {data:res1} = await this.$http.get('categories/'+pid)
				if (res1.meta.status!==200){
					return this.$message.error(res1.meta.msg)
				}
				this.editParentName = res1.data.cat_name
			}
			this.editCateForm = res.data
			this.editCateDialogVisible = true
		},
		// 提交编辑分类
		editCate(){
			this.$refs.editCateFormRef.validate(async valid=>{
				if(!valid) return
				const {data:res} = await this.$http.put('categories/'+ this.editCateForm.cat_id,{
					cat_name:this.editCateForm.cat_name
				})
				if (res.meta.status !== 200) {
					// console.log(res.meta.msg)
					return this.$message.error(res.meta.msg)
				}
				this.$message.success('修改分类成功')
				this.getCateList()
				this.editCateDialogVisible = false
			})
		},
		// 删除分类
		async removeCate(id) {
			const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
				confirmButtonText: '确定',
				cancelButtonText: '取消',
				type: 'warning'
			}).catch(err => err)
			// 如果用户确认删除，返回值为字符串 confirm
			// 如果用户取消删除，返回值为字符串 cancle
			console.log(confirmResult)
			if (confirmResult !== 'confirm') {
				return this.$message.info('取消删除')
			}
			const { data: res } = await this.$http.delete('categories/' + id)
			if (res.meta.status !== 200) {
				return this.$message.error(res.meta.msg)
			}
			this.$message.success(res.meta.msg)
			this.getCateList()
		}
	}
}
</script>

<style>
.treeTable {
	margin: 16px 0;
}
.el-cascader {
	width: 100%;
}
.el-cascader-panel {
	height: 300px !important;
}
</style>
